Australian visitng VISA for a Sri Lankan Pport holder?

I'm a Sri Lankan pport holder currently back on vacation from my studies in USA and i would like to visit Australia for a month or so before i head back to states. Does any one happened to know what's the visa procedure for visitng Australia (sine i'm from Sri Lanka a so called developing nation) what are the doents i will require including financial doents. Can some one pls help me with this information...? Thanks...!